[super__dan]

As everyone else says it defo 'should' work.

However I know on the Novak GTB it says (several times) not to under any circumstances run a brushless mtor connected when in brushed mode setup. In fact it specifically says not to have the sensor lead connected.

I assume there is a reason for this and so I fear you've blown something in the speedo that's needed for it to work in brushless mode by have the sensor wire connected.